net/xdp: use shift instead of 64 bit division
authorPavel Machek <pavel@ucw.cz>
Thu, 4 Jun 2020 21:42:59 +0000 (23:42 +0200)
committerDavid S. Miller <davem@davemloft.net>
Thu, 4 Jun 2020 23:02:58 +0000 (16:02 -0700)
64bit division is kind of expensive, and shift should do the job here.

Signed-off-by: Pavel Machek (CIP) <pavel@denx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/xdp/xdp_umem.c

index 1bbaf1747e4f98f0dfcb8754b409645395b4c974..a0d2b757807f21d269aa11d9ab5e17355e8251f0 100644 (file)
@@ -336,7 +336,7 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
        if ((addr + size) < addr)
                return -EINVAL;
 
-       npgs = div_u64(size, PAGE_SIZE);
+       npgs = size >> PAGE_SHIFT;
        if (npgs > U32_MAX)
                return -EINVAL;